Advices For Studying Organic Chemistry

O

O

Br

Br Cl

Capilin Dactylyne

3. Synthetic alkynes:
   
   
   1. Ethinyl estradiol, its estrogenlike properties have found use in oral
      contraceptives.
   
   
   
   

HO

H

H

H

CH 3 OH

Ethinyl estradiol ( 17 α-ethynyl-1,3,5(10)-estratriene-3,17β-diol)

2.2D BENZENE: A REPRESENTATIVE AROMATIC HYDROCARBON

1. Benzene can be written as a six-membered ring with alternating single and double
   bonds (Kekulé structure).
   H
   H

H

H

H

H

or

Kekulé structure Bond-line representation

2. The C−C bonds of benzene are all the same length (1.39 Å).


3. Resonance (valence bond, VB) theory: